{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40102", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.164Z", "datePublished": "2025-10-30T09:48:07.790Z", "dateUpdated": "2026-09-02T12:49:25.880Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-02T12:49:25.880Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Prevent access to vCPU events before init\n\nAnother day, another syzkaller bug. KVM erroneously allows userspace to\npend vCPU events for a vCPU that hasn't been initialized yet, leading to\nKVM interpreting a bunch of uninitialized garbage for routing /\ninjecting the exception.\n\nIn one case the injection code and the hyp disagree on whether the vCPU\nhas a 32bit EL1 and put the vCPU into an illegal mode for AArch64,\ntripping the BUG() in exception_target_el() during the next injection:\n\n kernel BUG at arch/arm64/kvm/inject_fault.c:40!\n Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n pc : exception_target_el+0x88/0x8c\n lr : pend_serror_exception+0x18/0x13c\n sp : ffff800082f03a10\n x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000\n x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000\n x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004\n x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000\n x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0\n x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000\n x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000\n x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20\n Call trace:\n exception_target_el+0x88/0x8c (P)\n kvm_inject_serror_esr+0x40/0x3b4\n __kvm_arm_vcpu_set_events+0xf0/0x100\n kvm_arch_vcpu_ioctl+0x180/0x9d4\n kvm_vcpu_ioctl+0x60c/0x9f4\n __arm64_sys_ioctl+0xac/0x104\n invoke_syscall+0x48/0x110\n el0_svc_common.constprop.0+0x40/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x34/0xf0\n el0t_64_sync_handler+0xa0/0xe4\n el0t_64_sync+0x198/0x19c\n Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000)\n\nReject the ioctls outright as no sane VMM would call these before\nKVM_ARM_VCPU_INIT anyway. Even if it did the exception would've been\nthrown away by the eventual reset of the vCPU's state." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kvm/arm.c" ], "versions": [ { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "b0ab34a9e4cd5b88b522cc156e792cefe3085334", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "d64461d38972302f0243498ff409b0d54e14e106", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "b498f0da45a388b40195f7198455c62fe366a372", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "7b854e68365a84dfa984ee81268e10b9311ac9d2", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "64a04e6320fc5affbadc59dc7024d79f909bfe84", "status": "affected", "versionType": "git" }, { "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a", "lessThan": "0aa1b76fe1429629215a7c79820e4b96233ac4a3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kvm/arm.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.5", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.10.269" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.187" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.108" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.17.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b0ab34a9e4cd5b88b522cc156e792cefe3085334" }, { "url": "https://git.kernel.org/stable/c/d64461d38972302f0243498ff409b0d54e14e106" }, { "url": "https://git.kernel.org/stable/c/b498f0da45a388b40195f7198455c62fe366a372" }, { "url": "https://git.kernel.org/stable/c/7b854e68365a84dfa984ee81268e10b9311ac9d2" }, { "url": "https://git.kernel.org/stable/c/c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc" }, { "url": "https://git.kernel.org/stable/c/64a04e6320fc5affbadc59dc7024d79f909bfe84" }, { "url": "https://git.kernel.org/stable/c/0aa1b76fe1429629215a7c79820e4b96233ac4a3" } ], "title": "KVM: arm64: Prevent access to vCPU events before init", "x_generator": { "engine": "bippy-1.2.0" } } } }